Stanley the white-tailed eagle flew off during a show in September and despite a number of sightings handlers were unable to catch him.

BBC: Eagle search called off by Warwick Castle

Stanley the white-tailed eagle flew off during a show last Thursday.

BBC: Warwick Castle eagle gives handlers slip

The Caspian, slightly larger than Germany, is a seasonal habitat for birds migrating from Europe and Asia, such as the flamingo and the rare white-tailed eagle.

ECONOMIST: The hidden costs of exploration in the Caspian